Contacting a gas and a liquid to remove an unwanted gas

摘要

PCT No. PCT/GB84/00243 Sec. 371 Date Mar. 7, 1985 Sec. 102(e) Date Mar. 7, 1985 PCT Filed Jul. 9, 1984 PCT Pub. No. WO85/00298 PCT Pub. Date Jan. 31, 1985.Sea water containing dissolved oxygen is pumped through a main gas ejector (4) supplied with nitrogen. During flow of the sea water and entrained nitrogen from the main gas ejector (4) to an auxiliary gas ejector (5), part of the entrained nitrogen is dissolved and displaces dissolved oxygen from solution. Most of the mixed nitrogen and oxygen collected in a separation chamber (6) is passed through a catalytic burner (7) to remove the unwanted oxygen which is replaced by nitrogen from a make-up source (9) and the resultant nitrogen mixture is fed to the main gas ejector (4) which is operated so as to provide sufficient suction to draw gas through the catalytic burner (7). Part of the mixed nitrogen and oxygen collected in the separation chamber (6) is fed to the auxiliary gas ejector (5) which is operated so as to increase the gas to liquid interface. Sea water and entrained nitrogen flow from the auxiliary gas ejector (5) to the separation chamber (6) through a stepped desorption tube (3) which causes additional turbulence and retards the flow of sea water thereby enhancing the solution of nitrogen and removal of oxygen. Sea water with reduced dissolved oxygen is continuously removed from the separation chamber (6).